Balanced throttle valve for steam-power plants



July 16, 1929.

R. R. WATERMAN BALANCED THROTTLE VALVE FOR STEAM POWER PL ANTS Filed May 17, 1926 7'0 ENG/NE INVENTOR. Russ e/IR. Waterman A TTORNE Y.

Patented Jul 16, 1929.

I UNITED STATES RUSSELL R. WATERM AN, OF LONG BEACIT,

PATENT OFFICE.

CALIFORNIA, ASSIGNOB T0 FARMERS NA- TIONAL BANK OF GREENVILLE, OHIO, OF GREENVILLE, OHIO, A CORPORATION OF 0310, TRUSTEE.

BALANCED THROTTLE VALVE FOR STEAM-POWER PLANTS.,

Application filed May 17,

My invention relates to a balanced throttle valve for a steam line from the boiler to the engine in steam power plants, and the objects of my invention are: first, to provide a throttle valve so constructed and arranged that the steam pressure from the boiler on the valve is balanced, permitting easy operation of the throttle valve; second, to provide a throttle valve so constructed that the back pressure from the engine is balanced; third, to provide a throttle valve that is practically leak proof; fourth, to provide a throttle valve that is easy to take apart for repairs; and, fifth, to provide a throttle valve of this class which is very simple and economical of construction, easy to install or remove, eflicient in its action and which will not readily deteriorate or get out of order.

With these and other objects in View as will appear hereinafter, my invention consists of certain novel features of construction, combination and arrangement of parts and portions as will be hereinafter described in detail and particularly set forth in the appended claims, reference being bad to the accompanying drawing and to the characters of reference thereon which form a part of this application, in which: a

Figure 1 is a vertical sectional view through my throttle valve, showing some of the parts and portions in elevation to facilitate the illustration, and Fig. 2 is a transverse sectional view taken on line 22, Fig. 1.

Similar characters of reference refer to similar parts and portions throughout the different views of the drawings.

The casing 1, casing head 2, stuffing-box 3, valve stem 4, valve memberj, piston 6 and valve seat member 7 constitute the principal parts and portions of my balanced throttle valve.

1926. Serial No. 109,567.

provided with an enlargement 17 in whichis,

reciprocally mounted the piston 6 having grooves on its outer face-to facilitate the steam seal. Further enlargement 18 is made of enlargement 17 to provide space for the valve seat member 7 which is provided with grooves on its outerface to facilitate the.

steam seal. The valve seat member 7 is so shaped as to provide two valve seats, one at point 8 and one at point 19, and between the two valve seats is provided a chamber 9.

The valve 5 is integrally attached to the end I of valve stem 4 and is provided with the tapered portion 12 which comes in contact with valve seat member 7 at point 19 and with a still larger portion 20 which comes in contact with valve seat member 7 at point 8; Bores 10, 10" and 10 are connected so as to provide one passage for steam. Bore 10 opens on one side of the valve 5 and into the chamber 9. Bore 10 opens on one side of the valve stem 4 into the cylindrical bore 11. Through the center of the tapered portion of the valve 12 and through the valve stem 4, between the bores 10 and 10", is an orifice 10.

When the valve 5 is opened the seal at the point 8 is broken permitting steam to enter the chamber 9, through which steam passes the tapered portion 12 resulting in a balancedpressure. Likewise the back pressure from the engine is approximately equal upon the piston 6 and the tapered portion 12. Thus the pressure from the boiler and the back pressure from the engine are both balanced which permits of very easy operation of the throttle valve.

Though I have shown and described a particular construction, combination and arrangement of parts and portions, I do not wish to be limited to this particular construction, combination and arrangement but de- I sire to include in the scope of myinvention on one side of said outlet means, a piston on the opposite side of saidoutlet means. connected to and of approximately the same diameter as said valve, a conduit means extending from and to the spaces at the remote sides of said valve and pistonrelative to each other, said conduit means communicating with said bore, and a valve of larger diameter than'the first valve secured to said first valve, there'being provided a steam chamber in the bore between the seats ofsaid valves, said conduit means being in communication with said steam chamber.

2. In a balanced throttle valve for steam engines, a casing provided with two valve seats ofditferent diameters said casing having an outlet at one side of the valve seats and an-inlet at the opposite sides thereof and also provided with a steam chamber positioned between the two valve seats, a valve, with two seat portions mounted thereonreciprocally mounted in said casing adapted to engage the two seats in said casingpsaid valve having a stem, a piston mounted on the valve stem and reciprocally mounted in said casing at the side of the outlet opposite said valve seats, and a bore in said valve and stem extending from the steam chamber to the space on the side of the piston farthest from the valve. 4

3. In a throttle valve for steam engines, a casing provided with boresof two different diameters therein with an inlet and an outlet, a valve seat member mountedin the larger ,bore and provided with two seats of differenton the side of the piston farthest from the valve.

4. In a throttle valve for steam engines, a casing provided with three diameter bores and an inlet and an outlet, a valve stem reciprocal- -ly mounted in the smallest diameter bore, a

piston secured to said valve stem and reciprocally mounted in the intermediate bore, a valve member in the'largest' bore secured to said valve stem and spaced from said piston and on the opposite side of the outlet in said casing from said piston, said valve provided with two seat portions of different diameters, the seat portion of smaller diameter being substantially equal to the diameter of said piscured to said valve stem and spaced from said piston and on the opposite side of the outlet in said casingfrom said piston, said valve provided with two seat portions of different diameters, the seat portion of smaller diame-. ter being substantially equal to the diameter of said piston, a valve seat member in the said casing having two valve seats of different diameters adapted' to engage the respective valve seat portions on said valve, and a conduit in said valve and said valve stem extending from between the two seat portions on said valve to the portion of the intermediate bore on the side of the piston farthest from the valve.

6. In a device of the class described, a casing provided with a bore, an inlet, an outlet,

and a pair of concentric valve seats in said bore, spaced axiall from each other and positioned between t 1e inlet and the outlet, a valve reciprocally mounted in the bore and provided with a pair of valve portions adapted to simultaneously engage the valve seats in said bore, and a piston portion connected to saidvalve on the opposite side of the outlet.

Intestimony whereof, I have hereunto set my hand at Los Angeles, California, this 10th day of May, 1926. V

RUSSELL R. WATERMAN. 

